Characteristics and applications of advanced ceramic materials- silicon carbide fiber
Advanced ceramics have excellent properties such as high temperature resistance, high strength and rigidity, relatively light weight, and corrosion resistance, but they also have an inherent Achilles heel: brittleness. The use of high-strength, high-modulus continuous ceramic fiber and matrix composite is an effective method to improve the toughness and reliability of ceramics.
At present, jet mill equipment has been used in the preparation of many advanced ceramic materials. However, fiber-reinforced ceramic matrix composites mainly refer to composites made of carbon fiber, graphite fiber, silicon carbide fiber, silicon nitride fiber, zirconia fiber, etc. to enhance magnesium oxide, silicon oxide, silicon nitride, aluminum oxide, zirconia, etc. The material has the characteristics of high high temperature compressive strength, high elastic modulus, strong oxidation resistance, and good impact resistance.
Silicon carbide fiber is a kind of ceramic fiber with high tensile strength, creep resistance, high temperature resistance, oxidation resistance and good compatibility with ceramic matrix. It is used in high-tech fields such as aerospace, aviation, weapons, shipbuilding and nuclear industry. It has broad application prospects.
The ultra-fine powder sintering method is mainly based on silicon carbide powder as raw material, adding a certain amount of binder and sintering aids (B, Al2O3, etc.), through physical mixing, dry spinning or melt spinning to make fibers The raw silk is subjected to high-temperature heat treatment to obtain silicon carbide fibers. The silicon carbide fiber prepared by this method has better high temperature resistance and creep resistance, but the fiber diameter is larger and the strength is lower, which is not conducive to industrial application.
Silicon carbide fiber has the advantages of good creep resistance, oxidation resistance, chemical corrosion resistance and compatibility with ceramic matrix. It can be used as a high-temperature structural material of fiber-reinforced ceramic matrix composites and can be widely used in aerospace and other fields.
In addition, the metal matrix composite material reinforced by silicon carbide fiber has better performance in terms of specific strength, specific stiffness, thermal expansion coefficient, thermal conductivity and wear resistance. It is used in aerospace, military weapons and equipment, sports equipment, automobiles, etc. The civil industry has a wide range of application prospects.